LAARS Mighty Therm AP (Sizes 500-1825) - Installation, Operation and Maintenance Instructions - Manual (Page 4)

LAARS Heating Systems
Page 4
Section 2
Installation
2.1 Heater Placement
The pool heater must be placed to provide specifi c
clearances on all sides for maintenance and inspections.
There must also be minimum distances maintained from
combustible surfaces. These clearances also apply to
noncombustible materials because the pool heater requires
air circulation for proper operation.
The pool heater should be mounted on a level surface. An
integral base for an installation on combustible fl ooring is
provided as standard equipment on outdoor models. For
indoor models, special base rails part number 10539000
must be used for combustible fl ooring.
Do not install a pool heater on carpeting.
Under the national Fuel Gas Code, ANSI Z223.1, it
is permissible to place the heater on fl oors other than
noncombustible when the installation complies with the
American Insurance Code. Figures 2, 3, 4 and 5 show
common installation on combustible fl ooring.
2.2 Installation of Indoor Heaters
Locate the pool heater to provide adequate clearance
for inspection and service on all sides. See Table 1. For
alcove installation, see Figure 6.
Install indoor heaters on a waterproof fl oor with an
adequate fl oor drain and a 6" (152mm) minimum curb on
all four sides to protect the building if heater repairs are
required. The manufacturer will not be held liable for
any water damage in connection with this heater.
2.2.1 Combustion Air Supply
The heater location must provide suffi cient air supply
for proper combustion and ventilation of the surrounding
area as outlined in the latest edition of ANSI standard
Z223.1, and any local codes that may be applicable. In-
adequate combustion air supply may result in incomplete
combustion, sooting of the heat exchanger, and unsafe
operation of the heater.
a. Conventional Ventilation
In the United States, the most common of these require-
ments specify that boiler rooms should be provided with
two permanent air supply openings communicating di-
rectly through the wall to outside air one within 12 inches
(305mm) of the ceiling, and the other within 12 inches
(305mm) of the fl oor. Each opening should have a mini-
mum free area of one square inch (6.5 sq. cm) per 4,000
BTU/hr input of the total input rating of all appliances in
the enclosed area. See Table 2 for recommended air supply
for each model. An improperly ventilated equipment room
can get excessively hot and cause accelerated deterioration
of controls and electrical components.
Pool heaters installed in vaults (“pits”) must have
combustion air ducted to bottom of the vault, even if the top
is unobstructed. Ducting should be sized for a minimum of
one square inch (6.5 sq. cm) per 2,000 BTU/hr input of the
Clearance Indoor Outdoor
from in. mm in. mm
Top 30 762 unobstructed
Water Conn. side 12* 305 24 610
Pump side 6* 152 24 610
Front Alcove* unobstructed
Rear 8 203 24 610
Vent pipe** 6 152 - - -
Hot water pipes per code per code
* Water connection and pump side clearances of 24"
(610mm) and front clearances of 48" (1219mm) will allow
easier service access.
** Using type B vent (refer to Manufacturer's Instructions).
Table 1 - Minimum Heater Clearances
from Adjacent Surfaces
Figure 2 - Typical Heater Installation on Concrete Slab
Figure 3 - Typical Heater Installation on Roof
Using
Raised Platform (Wood)
total input rating of all appliances in the vault. Contact the
Service Department for more information.
In Canada, Table 2 does not apply. Consult local building
codes or, in the absence of such requirements, follow
CSA B149 standard.